  /* css的注释 */
  h1{
    color:aqua;
    font-size: 5em;
}
div.box_outline{
  width: 500px;
  height: 200px;
  border: 5px solid blue;
}
div.box_size{
  width: 50%;
  min-width: 300px;
  height: 30%;
  background-color: crimson;
}
div.box_outline p{
  width: 100px;
  height: 30px;
  border: 1px dashed orange;
}